This section covers status and roadmaps for a collaborative project between ALU, Eurecom and INSA-Lyon related to large-scale system emulation with OpenAirInterface.
Required buidling blocks
UE RRC measurements event-triggering algorithm: This is the starting point for HO implementation. The algorithm for triggering the Measurement Reports needs to be implemented.
PHY Abstraction of UE RRC measurements: Above measurements to be provided in abstraction mode (this is essential for large-scale system simulations)
RRC procedures for supporting measurement signaling between eNB and UE has already been implemented.
Multi-cell simulations in eNB have been tested only by disabling channel models (using -S/-s options). This needs to be tested in abstraction mode with more than 2 eNBs and multiple Ues.
UE detachment from cell and reattachment to new cell needs to be tested using -J option in oaisim. This is critical for HO implementation.
Possibility of using a hack for the X2 interface to avoid delays in full X2 implementation were discussed. This needs to be discussed in detail in future.
A scenario needs to be fixed for the simulation which will allow performance analysis of ALU's ICIC algorithm (URGENT)
There is no link between topology model and channel model, currently in oaisim there is a hexagonal topology by default and this needs to support other topologies (eg: cellular). The channel models also need to support the topology.
Scheduling periodic PUSCH allocations for UEs in order to get sub-band UE feedback requires a change (hack?) in the eNB scheduler.
Changes in MAC/PHY at the UE (and eNB?) to support attachment to new cell during HO needs to be done.